Web service consumption may account for a nonnegligible share of the energy that is consumed by mobile applications. Unawareness of the energy consumption characteristics of Web service-based applications during development may cause the battery of devices, e.g., smartphones, to run out more frequently. Compared to related exeprimental energy consumption studies, the work at hand is the first work that focuses on factors which are specific to services computing, such as the timing of Web service invocations and the Web service response caching logic. Further, Web service invocations are the only variable energy-consuming activity included in the experiments. Based on the results, it is shown, firstly, how the execution of exactly the same Web service invocations may lead to energy consumption results that present differences of up to ca. 15% for WLAN and ca. 60% for UMTS connections, and, secondly, how rules and techniques for energy-efficient development of mobile Web service-based applications can be extracted from the gained knowledge.
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